CN106054351B - Optical imaging system - Google Patents

Optical imaging system Download PDF

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Publication number
CN106054351B
CN106054351B CN201610149284.XA CN201610149284A CN106054351B CN 106054351 B CN106054351 B CN 106054351B CN 201610149284 A CN201610149284 A CN 201610149284A CN 106054351 B CN106054351 B CN 106054351B
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China
Prior art keywords
lens
imaging system
optical imaging
optical
optical axis
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CN201610149284.XA
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CN106054351A (en
Inventor
李鸿文
刘燿维
张永明
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Ability Opto Electronics Technology Co Ltd
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Ability Opto Electronics Technology Co Ltd
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses an optical imaging system which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side. The first lens element with positive refractive power has a convex object-side surface. The second lens element to the third lens element have refractive power, and both surfaces of the lens elements may be aspheric. The fourth lens element with negative refractive power has a concave image-side surface, wherein both surfaces of the fourth lens element are aspheric, and at least one surface of the fourth lens element has an inflection point. The lens elements with refractive power in the optical imaging system are the first lens element to the fourth lens element. When the specific conditions are met, the optical imaging device can have larger light receiving capacity and better optical path adjusting capacity so as to improve the imaging quality.

Description

Optical imaging system
Technical field
The invention relates to a kind of optical imaging systems, and in particular to a kind of applied to small on electronic product Type optical imaging system.
Background technique
In recent years, with the rise of the portable electronic product with camera function, the demand of optical system is increasingly improved. The photosensitive element of general optical system is nothing more than being photosensitive coupling element (Charge Coupled Device；CCD) or complementary Matal-oxide semiconductor element (Complementary Metal-Oxide SemiconduTPor Sensor；CMOS Sensor) two kinds, and progressing greatly with semiconductor fabrication process so that the Pixel Dimensions of photosensitive element reduce, optical system by Gradually develop toward high pixel neighborhoods, therefore the requirement to image quality also increasingly increases.
Tradition is equipped on the optical system on mancarried device, mostly uses based on two or three-chip type lens arrangement, however Due to mancarried device constantly towards improve demand such as low-light to large aperture of pixel and terminal consumer and night shooting function or It is the Self-timer of for example preposition camera lens of demand to wide viewing angle.The optical system for only designing large aperture, which often faces, generates more pictures Difference cause periphery image quality with deterioration and manufacture the situation of difficulty, and the optical system for designing wide viewing angle can then face The aberration rate (distortion) of imaging improves, and existing optical imaging system has been unable to satisfy the photography requirement of higher order.
Therefore, how to effectively increase the light-inletting quantity of optical imaging system and increase the visual angle of optical imaging system, remove into one Total picture element that step improves imaging can take into account the design of weighing and considering in order to uphold justice of micromation optical imaging system with quality simultaneously outside, become as a phase When important subject under discussion.
Summary of the invention
The aspect of the embodiment of the present invention is directed to a kind of optical imaging system, can utilize refractive power, the convex surface of four lens (object side that convex surface or concave surface of the present invention refer to each lens in principle or image side surface are in the geometry on optical axis with the combination of concave surface Shape description), so effectively improve optical imaging system light-inletting quantity and increase optical imaging system visual angle, while improve at The total picture element and quality of picture, to be applied on small-sized electronic product.
The term and its code name of the relevant lens parameter of the embodiment of the present invention arrange reference as follows, as subsequent descriptions in detail:
With length or the related lens parameter of height
The image height of optical imaging system is indicated with HOI；The height of optical imaging system is indicated with HOS；Optical imagery The first lens object side to the distance between the 4th lens image side surface of system is indicated with InTL；4th lens of optical imaging system Image side surface to the distance between imaging surface is indicated with InB；InTL+InB=HOS；The fixed diaphram (aperture) of optical imaging system is extremely Distance between imaging surface is indicated with InS；First lens of optical imaging system between the second lens at a distance from (example indicated with IN12 Show)；First lens of optical imaging system indicate (illustration) in the thickness on optical axis with TP1.
Lens parameter related with material
The abbe number of first lens of optical imaging system indicates (illustration) with NA1；The laws of refraction of first lens is with Nd1 It indicates (illustration).
Lens parameter related with visual angle
Visual angle is indicated with AF；The half at visual angle is indicated with HAF；Chief ray angle is indicated with MRA.
Lens parameter related with entrance pupil out
The entrance pupil diameter of optical imaging system is indicated with HEP.
Parameter related with lens face shape deflection depth
4th lens object side is in the maximum effective radius position of the intersection point on optical axis to the 4th lens object side in optical axis Horizontal displacement distance (illustration) is indicated with InRS41；4th lens image side surface is in the intersection point on optical axis to the 4th lens image side surface Maximum effective radius position (illustration) is indicated with InRS42 in the horizontal displacement distance of optical axis.
Parameter related with lens face type
Critical point C refers on certain lenses surface, and in addition to the intersection point with optical axis, one is tangent with the perpendicular section of optical axis Point.It holds, such as the critical point C31 of the third lens object side and the vertical range of optical axis are HVT31 (illustration), the third lens picture The critical point C32 of side and the vertical range of optical axis are HVT32 (illustration), the critical point C41 and optical axis of the 4th lens object side Vertical range be HVT41 (illustrations), the vertical range of the critical point C42 of the 4th lens image side surface and optical axis is HVT42 (example Show).On 4th lens object side closest to the point of inflexion of optical axis be IF411, this sinkage SGI411, between the point and optical axis Vertical range is HIF411 (illustration).On 4th lens image side surface closest to the point of inflexion of optical axis be IF421, the sinkage SGI421 (illustration), the vertical range between the point and optical axis are HIF421 (illustration).Second close to light on 4th lens object side The point of inflexion of axis is IF412, this sinkage SGI412 (illustration), and the vertical range between the point and optical axis is HIF412 (example Show).On 4th lens image side surface second close to optical axis the point of inflexion be IF422, this sinkage SGI422 (illustrations), the point and Vertical range between optical axis is HIF422 (illustration).
Parameter related with aberration
The optical distortion (Optical Distortion) of optical imaging system is indicated with ODT；Its TV distortion (TV Distortion it) is indicated with TDT, and can further limit what description aberration between 50% to 100% visual field is imaged deviated Degree；Spherical aberration offset amount is indicated with DFS；Comet aberration offset is indicated with DFC.
The present invention provides a kind of optical imaging system, and the object side of the 4th lens or image side surface are provided with the point of inflexion, can The angle that each visual field is incident in the 4th lens is effectively adjusted, and is maked corrections for optical distortion and TV distortion.In addition, the 4th is saturating The surface of mirror can have more preferably optical path adjusting ability, to promote image quality.
A kind of optical imaging system is provided according to the present invention, by object side to image side sequentially include the first lens, the second lens, The third lens and the 4th lens.First lens have refracting power with positive refracting power and the 4th lens.4th lens Object side surface and image side surface be all it is aspherical, the focal length of the optical imaging system is f, and the entrance pupil of the optical imaging system is straight Diameter is HEP, and the half at the maximum visual angle of the optical imaging system is HAF, and the first lens object side to the imaging surface has one Distance HOS meets following condition: 1.2≤f/HEP≤3.0；And 0.5≤HOS/f≤3.0.
Preferably, the optical imaging system in knot as when TV distortion be TDT, the optical imaging system in knot as when Optical distortion be ODT, the half of the visible angle of the optical imaging system is HAF, meets following equation: 0deg < HAF ≦70deg；│ TDT │ < 60% and │ ODT │ < 50%.
Preferably, the third lens and its at least surface for distinguishing lens of the 4th lens have at least one The point of inflexion.
Preferably, any surface of the 4th lens all has at least one point of inflexion.
Preferably, first lens and its at least surface for distinguishing lens of second lens have at least one The point of inflexion.
Preferably, the vertical range between the point of inflexion and optical axis is HIF, meets following equation: 0mm < HIF≤5mm.
Preferably, the 4th lens are negative refracting power.
Preferably, the first lens object side to the 4th lens image side surface has a distance InTL, and under satisfaction Column formula: 0.5≤InTL/HOS≤0.9.
Preferably, an aperture is further included, there is a distance InS, institute in aperture described on the optical axis to the imaging surface Optical imaging system is stated equipped with an image sensing component in the imaging surface, the effective sensing region of image sensing component is diagonal The half of wire length is HOI, meets following relationship: 0.5≤InS/HOS≤1.2；And 0 < HIF/HOI≤0.9.
A kind of optical imaging system is separately provided according to the present invention, by object side to image side sequentially include the first lens, second thoroughly Mirror, the third lens and the 4th lens.First lens have positive refracting power, and object side and image side surface are all aspherical.Second Lens have refracting power.The third lens have refracting power.4th lens have refracting power.4th lens have refracting power, object Side and image side surface are all aspherical.The focal length of the optical imaging system is f, and the entrance pupil diameter of the optical imaging system is HEP, the half at the maximum visual angle of the optical imaging system are HAF, and the first lens object side to the imaging surface has a distance HOS, the optical imaging system in knot as when optical distortion be ODT and TV distortion is TDT, meet following condition: 1.2≤ f/HEP≦3.0；0.4≦│tan(HAF)│≦3.0；0.5≦HOS/f≦3.0；│ TDT │ < 60%；And │ ODT │≤50%.
Preferably, the third lens and its at least surface for distinguishing lens of the 4th lens have at least one The point of inflexion.
Preferably, first lens and its at least surface for distinguishing lens of second lens have at least one The point of inflexion.
Preferably, the optical imaging system meets following equation: 0mm < HOS≤7mm.
Preferably, first lens are IN12 at a distance from optical axis between second lens, and are met following Formula: 0 < IN12/f≤0.2.
Preferably, the third lens are IN34 at a distance from optical axis between the 4th lens, and are met following Formula: 0 < IN34/f≤0.2.
Preferably, the third lens are in, with a thickness of TP3, and meeting following equation: 0 < TP3/f≤0.2 on optical axis.
Preferably, the 4th lens are in, with a thickness of TP4, and meeting following equation: 0 < TP4/f≤0.2 on optical axis.
Preferably, first lens and second lens in the thickness on optical axis be respectively TP1 and TP2, it is described First lens are IN12 at a distance from optical axis between second lens, meet following condition: 0 < (TP1+IN12)/ TP2≦10。
Preferably, the focal length of first lens to the 4th lens is respectively f1, f2, f3, f4, the optical imagery System meets following condition: │≤2 0 < │ f/f1；0<│f/f2│≦2；0<│f/f3│≦2；And │≤3 0 < │ f/f4.
A kind of optical imaging system is provided again according to the present invention, by object side to image side sequentially include the first lens, second thoroughly Mirror, the third lens and the 4th lens.First lens have positive refracting power, and object side and image side surface are all aspherical.Second Lens have negative refracting power.The third lens have refracting power.4th lens have refracting power, and a wherein at least surface has at least One point of inflexion, object side and image side surface are all aspherical.The focal length of the optical imaging system is f, the optical imaging system Entrance pupil diameter is HEP, and the half at the maximum visual angle of the optical imaging system is HAF, the first lens object side to the imaging Face have a distance HOS, the optical imaging system in knot as when optical distortion be ODT and TV distortion be TDT, meet under Column condition: 1.2≤f/HEP≤2.8；0.4≦│tan(HAF)│≦1.5；0.5≦HOS/f≦2.5；│ TDT │ < 1.5%；And │ ODT │≤2.5%.
Preferably, the vertical range between the point of inflexion and optical axis is HIF, meets following equation: 0mm < HIF≤5mm.
Preferably, point of the focal length f of the optical imaging system and focal length fp per a piece of lens with positive refracting power Other ratio f/fp is point of PPR, the focal length f of the optical imaging system and the focal length fn per a piece of lens with negative refracting power Other ratio f/fn is NPR, and the PPR summation of the lens of all positive refracting powers is Σ PPR, and the NPR of the lens of all negative refracting powers is total With for Σ NPR, meet following condition: │≤4.5 0.5≤Σ PPR/ │ Σ NPR.
Preferably, first lens and the second lens are respectively TP1, TP2 in the thickness on optical axis, are met following Condition: 0 < TP1/TP2≤10.
Preferably, the third lens and the 4th lens are respectively TP3 and TP4 in the thickness on optical axis, are met Following condition: 0 < TP3/TP4≤10.
Preferably, an aperture is further included, there is a distance InS, institute in aperture described on the optical axis to the imaging surface It states optical imaging system and 8,000,000 pixels, the image in the imaging surface and is at least set equipped with an image sensing component The half of the effective sensing region diagonal line length of sensing component is HOI, meets following relationship: 0.5≤InS/HOS≤1.2；And HOI>2.3mm。
Aforementioned optical imaging system, which can be used to arrange in pairs or groups, is imaged on catercorner length as 1/1.2 English inch size image sense below Component is surveyed, the size preferably of the image sensing component is 1/2.3 English inch, and the Pixel Dimensions of the image sensing component are less than 1.4 Micron (μm), preferably its Pixel Dimensions is less than 1.12 microns (μm), its Pixel Dimensions of the best are less than 0.9 micron (μm).This Outside, which is applicable to the image sensing component that length-width ratio is 16:9.
Aforementioned optical imaging system be applicable to million or ten million pixel or more camera requirement (such as 4K2K or UHD, QHD) and possess good image quality.
As │ f1 │ > f4, the system total height (HOS of optical imaging system；Height of Optic System) it can be with It is appropriate to shorten to achieve the purpose that micromation.
As │ f2 │+│ f3 │ > │ f1 │+│ f4 │, by the second lens into the third lens an at least lens have it is weak just Refracting power or weak negative refracting power.Alleged weak refracting power refers to that the absolute value of the focal length of certain lenses is greater than 10.As the present invention second Lens at least lens into the third lens have weak positive refracting power, can effectively share the positive refracting power of the first lens and keep away Exempt from unnecessary aberration to occur too early, if the second anti-lens at least lens into the third lens have weak negative refracting power, The aberration of correcting system can then be finely tuned.
4th lens can have negative refracting power, and image side surface can be concave surface.Whereby, be conducive to shorten its back focal length to maintain Miniaturization.In addition, an at least surface for the 4th lens can have an at least point of inflexion, it can effectively suppress off-axis field rays and enter The angle penetrated, further can modified off-axis visual field aberration.
Detailed description of the invention
The above-mentioned and other feature of the present invention will be described in detail by referring to accompanying drawing.
Figure 1A is painted the schematic diagram of the optical imaging system of first embodiment of the invention；
Figure 1B is sequentially painted spherical aberration, astigmatism and the optics of the optical imaging system of first embodiment of the invention from left to right The curve graph of distortion；
Fig. 1 C is painted the TV distortion curve of the optical imaging system of first embodiment of the invention；
Fig. 2A is painted the schematic diagram of the optical imaging system of second embodiment of the invention；
Fig. 2 B is sequentially painted spherical aberration, astigmatism and the optics of the optical imaging system of second embodiment of the invention from left to right The curve graph of distortion；
Fig. 2 C is painted the TV distortion curve of the optical imaging system of second embodiment of the invention；
Fig. 3 A is painted the schematic diagram of the optical imaging system of third embodiment of the invention；
Fig. 3 B is sequentially painted spherical aberration, astigmatism and the optics of the optical imaging system of third embodiment of the invention from left to right The curve graph of distortion；
Fig. 3 C is painted the TV distortion curve of the optical imaging system of third embodiment of the invention；
Fig. 4 A is painted the schematic diagram of the optical imaging system of fourth embodiment of the invention；
Fig. 4 B is sequentially painted spherical aberration, astigmatism and the optics of the optical imaging system of fourth embodiment of the invention from left to right The curve graph of distortion；
Fig. 4 C is painted the TV distortion curve of the optical imaging system of fourth embodiment of the invention；
Fig. 5 A is painted the schematic diagram of the optical imaging system of fifth embodiment of the invention；
Fig. 5 B is sequentially painted spherical aberration, astigmatism and the optics of the optical imaging system of fifth embodiment of the invention from left to right The curve graph of distortion；
Fig. 5 C is painted the TV distortion curve of the optical imaging system of fifth embodiment of the invention；
Fig. 6 A is painted the schematic diagram of the optical imaging system of sixth embodiment of the invention；
Fig. 6 B is sequentially painted spherical aberration, astigmatism and the optics of the optical imaging system of sixth embodiment of the invention from left to right The curve graph of distortion；
Fig. 6 C is painted the TV distortion curve of the optical imaging system of sixth embodiment of the invention.
Description of symbols
Optical imaging system: 1,20,30,40,50,60
Aperture: 100,200,300,400,500,600
First lens: 110,210,310,410,510,610
Object side: 112,212,312,412,512,612
Image side surface: 114,214,314,414,514,614
Second lens: 120,220,320,420,520,620
Object side: 122,222,322,422,522,622
Image side surface: 124,224,324,424,524,624
The third lens: 130,230,330,430,530,630
Object side: 132,232,332,432,532,632
Image side surface: 134,234,334,434,534,634
4th lens: 140,240,340,440,540,640
Object side: 142,242,342,442,542,642
Image side surface: 144,244,344,444,544,644
Infrared filter: 170,270,370,470,570,670
Imaging surface: 180,280,380,480,580,680
Image sensing component: 190,290,390,490,590,690
The focal length of optical imaging system: f
The focal length of first lens: f1；The focal length of second lens: f2；The focal length of the third lens: f3；
The focal length of 4th lens: f4
The f-number of optical imaging system: f/HEP；Fno；F#
The half at the maximum visual angle of optical imaging system: HAF
The abbe number of first lens: NA1
The abbe number of second lens to the 4th lens: NA2, NA3, NA4
The radius of curvature of first lens object side and image side surface: R1, R2
The radius of curvature of second lens object side and image side surface: R3, R4
The radius of curvature of the third lens object side and image side surface: R5, R6
The radius of curvature of 4th lens object side and image side surface: R7, R8
First lens are in the thickness on optical axis: TP1
Second lens to the 4th lens are in the thickness on optical axis: TP2, TP3, TP4
The thickness summation of the lens of all tool refracting powers: Σ TP
First lens and the second lens are in the spacing distance on optical axis: IN12
Second lens and the third lens are in the spacing distance on optical axis: IN23
The third lens and the 4th lens are in the spacing distance on optical axis: IN34
4th lens object side is in the intersection point on optical axis to the maximum effective radius of the 4th lens object side
Position is in the horizontal displacement distance of optical axis: InRS41
Closest to the point of inflexion of optical axis on 4th lens object side: IF411；The sinkage: SGI411
Closest to the vertical range between the point of inflexion and optical axis of optical axis on 4th lens object side: HIF411
Closest to the point of inflexion of optical axis on 4th lens image side surface: IF421；The sinkage: SGI421
Closest to the vertical range between the point of inflexion and optical axis of optical axis on 4th lens image side surface: HIF421
On 4th lens object side second close to optical axis the point of inflexion: IF412；The sinkage:
SGI412
4th lens object side second is close to the vertical range between the point of inflexion and optical axis of optical axis: HIF412
On 4th lens image side surface second close to optical axis the point of inflexion: IF422；The sinkage:
SGI422
4th lens image side surface second is close to the vertical range between the point of inflexion and optical axis of optical axis: HIF422
The point of inflexion of the third close to optical axis on 4th lens object side: IF413；The sinkage:
SGI413
4th lens object side third is close to the vertical range between the point of inflexion and optical axis of optical axis: HIF413
The point of inflexion of the third close to optical axis on 4th lens image side surface: IF423；The sinkage:
SGI423
4th lens image side surface third is close to the vertical range between the point of inflexion and optical axis of optical axis: HIF423
On 4th lens object side the 4th close to optical axis the point of inflexion: IF414；The sinkage:
SGI414
4th lens object side the 4th is close to the vertical range between the point of inflexion and optical axis of optical axis: HIF414
On 4th lens image side surface the 4th close to optical axis the point of inflexion: IF424；The sinkage:
SGI424
4th lens image side surface the 4th is close to the vertical range between the point of inflexion and optical axis of optical axis: HIF424
The critical point of 4th lens object side: C41；The critical point of 4th lens image side surface: C42
The critical point of 4th lens object side and the horizontal displacement distance of optical axis: SGC41
The critical point of 4th lens image side surface and the horizontal displacement distance of optical axis: SGC42
The critical point of 4th lens object side and the vertical range of optical axis: HVT41
The critical point of 4th lens image side surface and the vertical range of optical axis: HVT42
System total height (the first lens object side to imaging surface is in the distance on optical axis): HOS
The catercorner length of image sensing component: Dg；Aperture to imaging surface distance: InS
The distance of first lens object side to the 4th lens image side surface: InTL
4th lens image side surface to the imaging surface distance: InB
The half (maximum image height) of the effective sensing region diagonal line length of image sensing component: HOI
Optical imaging system in knot as when TV distort (TV Distortion): TDT
Optical imaging system in knot as when optical distortion (Optical Distortion): ODT
Specific embodiment
A kind of optical imaging system sequentially includes the first lens, the second lens, third for having refracting power by object side to image side Lens and the 4th lens.Optical imaging system more may include an image sensing component, be set to imaging surface.
Optical imaging system is designed using three operation wavelengths, respectively 486.1nm, 587.5nm, 656.2nm, Middle 587.5nm be main reference wavelength and with 555nm be main extractive technique feature reference wavelength.
The focal length f of optical imaging system and per a piece of lens with positive refracting power focal length fp ratio PPR, optics at The ratio NPR of focal length f as the system and focal length fn per a piece of lens with negative refracting power, the lens of all positive refracting powers PPR summation is Σ PPR, and the NPR summation of the lens of all negative refracting powers is Σ NPR, facilitates to control when meeting following condition The total refracting power and total length of optical imaging system: │≤4.5 0.5≤Σ PPR/ │ Σ NPR, it is preferable that following item can be met Part: │≤3.5 1≤Σ PPR/ │ Σ NPR.
The system altitude of optical imaging system be HOS, when HOS/f ratio level off to 1 when, be beneficial to production micromation and The optical imaging system of superelevation picture element can be imaged.
The summation of the focal length fp per a piece of lens with positive refracting power of optical imaging system is Σ PP, is had per a piece of The focal length summation of the lens of negative refracting power is Σ NP, and a kind of embodiment of optical imaging system of the invention meets following Condition: PP≤200 0 < Σ；And PP≤0.85 f1/ Σ.Preferably, following condition: PP≤150 0 < Σ can be met；And 0.01 ≦f1/ΣPP≦0.65.Whereby, facilitate the focusing capability of control optical imaging system, and appropriate distribution system is just in the wrong Power is rolled over to inhibit significant aberration to generate too early.
First lens can have positive refracting power, and object side can be convex surface.Whereby, can the first lens of appropriate adjustment just bend Power intensity is rolled over, the total length for shortening optical imaging system is facilitated.
Second lens can have negative refracting power.Whereby, the aberration that first lens that can make corrections generate.
The third lens can have positive refracting power.Whereby, the positive refracting power of the first lens can be shared.
4th lens can have negative refracting power, and image side surface can be concave surface.Whereby, be conducive to shorten its back focal length to maintain Miniaturization.In addition, an at least surface for the 4th lens can have an at least point of inflexion, it can effectively suppress off-axis field rays and enter The angle penetrated, further can modified off-axis visual field aberration.Preferably, object side and image side surface all have an at least contrary flexure Point.
Optical imaging system can further include an image sensing component, be set to imaging surface.Image sensing component effective feeling The half (the as image height of optical imaging system or maximum image height) for surveying region diagonal line length is HOI, the first lens object Side is HOS in the distance on optical axis to imaging surface, meets following condition: HOS/HOI≤3；And 0.5≤HOS/f≤ 3.0.Preferably, following condition: 1≤HOS/HOI≤2.5 can be met；And 1≤HOS/f≤2.Whereby, optical imagery can be maintained The miniaturization of system, to be equipped on frivolous portable electronic product.
In addition, an at least aperture settable on demand is helped in optical imaging system of the invention with reducing stray light In the promotion quality of image.
In optical imaging system of the invention, aperture configuration can for preposition aperture or in set aperture, wherein preposition aperture anticipate I.e. aperture is set between object and the first lens, in set aperture then and indicate that aperture is set between the first lens and imaging surface.If Aperture is preposition aperture, and the emergent pupil of optical imaging system and imaging surface can be made to generate longer distance and accommodate more optics groups Part, and the efficiency that image sensing component receives image can be increased；Aperture is set if in, is facilitated the field angle of expansion system, is made Optical imaging system has the advantage of wide-angle lens.Aforementioned aperture to the distance between imaging surface is InS, meets following condition: 0.5≦InS/HOS≦1.2.Preferably, can meet following condition: 0.8≤InS/HOS≤1 whereby, can combine maintenance light It learns the miniaturization of imaging system and has the characteristic of wide-angle.
In optical imaging system of the invention, the first lens object side to the distance between the 4th lens image side surface is InTL, In the thickness summation Σ TP of the lens of tool refracting powers all on optical axis, meet following condition: 0.45≤Σ TP/InTL≤ 0.95.Preferably, following condition: TP/InTL≤0.9 0.6≤Σ can be met.Whereby, when pair that can combine system imaging Than degree and the yield of lens manufacture and back focal length appropriate is provided to accommodate other assemblies.
The radius of curvature of first lens object side is R1, and the radius of curvature of the first lens image side surface is R2, is met following Condition: │≤0.5 0.01≤│ R1/R2.Whereby, the first lens has appropriate positive refracting power intensity, and spherical aberration increase is avoided to overrun. Preferably, following condition: │≤0.25 0.01≤│ R1/R2 can be met.
The radius of curvature of 4th lens object side is R7, and the radius of curvature of the 4th lens image side surface is R8, is met following Condition: -200 < (R7-R8)/(R7+R8) < 30.Whereby, be conducive to correct astigmatism caused by optical imaging system.
First lens and the second lens are IN12 in the spacing distance on optical axis, meet following condition: 0 < IN12/f≤ 0.2.Preferably, following condition: 0.01≤IN12/f≤0.20 can be met.Whereby, facilitate the color difference of improvement lens to be promoted Its performance.
Second lens and the third lens are IN23 in the spacing distance on optical axis, meet following condition: 0 < IN23/f≤ 0.25.Preferably, following condition: 0.01≤IN23/f≤0.20 can be met.Whereby, facilitate the performance of improvement lens.
The third lens and the 4th lens are IN34 in the spacing distance on optical axis, meet following condition: 0 < IN34/f≤ 0.2.Preferably, following condition: 0.001≤IN34/f≤0.20 can be met.Whereby, facilitate the performance of improvement lens.
First lens and the second lens are respectively TP1 and TP2 in the thickness on optical axis, meet following condition: 0≤ (TP1+IN12)/TP2≦10.Whereby, facilitate to control the susceptibility of optical imaging system manufacture and promote its performance.
The third lens and the 4th lens are respectively TP3 and TP4 in the thickness on optical axis, aforementioned two lens on optical axis it Spacing distance is IN34, meets following condition: 0.2≤(TP4+IN34)/TP4≤3.Whereby, facilitate to control optical imagery The susceptibility of system manufacture simultaneously reduces system total height.
Second lens and the third lens are IN23 in the spacing distance on optical axis, and the first lens to the 4th lens are on optical axis Summation distance be Σ TP, meet following condition: ()≤0.5 TP2+IN23+TP3 0.01≤IN23/.Preferably, can meet Following condition: ()≤0.4 TP2+IN23+TP3 0.05≤IN23/.It helps whereby and corrects incident light traveling process institute a little layer by layer The aberration of generation simultaneously reduces system total height.
In optical imaging system of the invention, the 4th lens object side 142 is in the intersection point on optical axis to the 4th lens object side The maximum effective radius position in face 142 is InRS41 (if horizontal displacement is towards image side, InRS41 in the horizontal displacement distance of optical axis For positive value；If horizontal displacement, towards object side, InRS41 is negative value), the 4th lens image side surface 144 is in the intersection point on optical axis to the 4th The maximum effective radius position of lens image side surface 144 is InRS42 in the horizontal displacement distance of optical axis, and the 4th lens 140 are in optical axis On with a thickness of TP4, meet following condition: -1mm≤InRS41≤1mm；-1mm≦InRS42≦1mm；1mm≦│InRS41 │+│InRS42│≦2mm；0.01≦│InRS41│/TP4≦10；0.01≦│InRS42│/TP4≦10.Whereby, it can control the 4th Maximum effective radius position between lens two sides, and facilitate the lens error correction of the peripheral vision of optical imaging system and effectively tie up Hold its miniaturization.
In optical imaging system of the invention, the 4th lens object side in the intersection point on optical axis to the 4th lens object side most The horizontal displacement distance parallel with optical axis indicates that the 4th lens image side surface is on optical axis with SGI411 between the point of inflexion of dipped beam axis Intersection point to horizontal displacement distance parallel with optical axis between the point of inflexion of the 4th nearest optical axis of lens image side surface with SGI421 table Show, meets following condition: ()≤0.9 SGI411+TP4 0 < SGI411/；0<SGI421/(SGI421+TP4)≦0.9.It is preferred that Ground can meet following condition: ()≤0.7 SGI411+TP4 0.01 < SGI411/；0.01<SGI421/(SGI421+TP4)≦ 0.7。
4th lens object side is in the intersection point on optical axis to the 4th lens object side second close between the point of inflexion of optical axis The horizontal displacement distance parallel with optical axis indicates that the 4th lens image side surface is in the intersection point on optical axis to the 4th lens picture with SGI412 Side second is indicated close to horizontal displacement distance parallel with optical axis between the point of inflexion of optical axis with SGI422, meets following item Part: ()≤0.9 SGI412+TP4 0 < SGI412/；0<SGI422/(SGI422+TP4)≦0.9.Preferably, following item can be met Part: ()≤0.8 SGI412+TP4 0.1≤SGI412/；0.1≦SGI422/(SGI422+TP4)≦0.8.
Vertical range between the point of inflexion and optical axis of the 4th nearest optical axis in lens object side indicates with HIF411, the 4th lens Image side surface in the intersection point on optical axis to the vertical range between the point of inflexion and optical axis of the 4th nearest optical axis of lens image side surface with HIF421 is indicated, meets following condition: 0≤HIF411/HOI≤0.9；0≦HIF421/HOI≦0.9.Preferably, can meet Following condition: 0.09≤HIF411/HOI≤0.5；0.09≦HIF421/HOI≦0.5.
4th lens object side second indicates close to the vertical range between the point of inflexion and optical axis of optical axis with HIF412, the 4th Lens image side surface in the point of inflexion of the intersection point on optical axis to the 4th lens image side surface second close to optical axis it is vertical between optical axis away from It is indicated from HIF422, meets following condition: 0≤HIF412/HOI≤0.9；0≦HIF422/HOI≦0.9.Preferably, may be used Meet following condition: 0.09≤HIF412/HOI≤0.8；0.09≦HIF422/HOI≦0.8.
A kind of embodiment of optical imaging system of the invention, can be by with high abbe number and low abbe number Lens are staggered, and help the amendment of optical imaging system color difference.
Above-mentioned aspherical equation are as follows:
Z=ch2/[1+[1-(k+1)c2h2]0.5]+A4h4+A6h6+A8h8+A10h10+A12h12+A14h14+A16h16+ A18h18+A20h20+…(1)
Wherein, z is along optical axis direction in the positional value that be highly the position of h make to refer to surface vertices, and k is conical surface system Number, c is the inverse of radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are order aspherical coefficients.
In optical imaging system provided by the invention, the material of lens can be plastics or glass.When lens material be plastics, Production cost and weight can be effectively reduced.The another material for working as lens is glass, then can control fuel factor and increase optics The design space of imaging system refracting power configuration.In addition, in optical imaging system the object side of the first lens to the 4th lens and Image side surface can get more control variable, in addition to cut down aberration, compared to traditional glass lens to be aspherical The number used using can even reduce lens, therefore the total height of optical imaging system of the present invention can be effectively reduced.
Furthermore in optical imaging system provided by the invention, if lens surface is convex surface, then it represents that lens surface is in dipped beam It is convex surface at axis；If lens surface is concave surface, then it represents that lens surface is concave surface at dipped beam axis.
In addition, an at least light bar settable on demand is helped in optical imaging system of the invention with reducing stray light In the promotion quality of image.
The more visual demand of optical imaging system of the invention is applied in the optical system of mobile focusing, and has both excellent picture The characteristic of difference amendment and good image quality, to expand application.
According to above embodiment, specific embodiment set forth below simultaneously cooperates schema to be described in detail.
First embodiment
Figure 1A and Figure 1B is please referred to, wherein Figure 1A is painted a kind of optical imaging system according to first embodiment of the invention Schematic diagram, Figure 1B are sequentially spherical aberration, astigmatism and the optical distortion curve graph of the optical imaging system of first embodiment from left to right. Fig. 1 C is the TV distortion curve of the optical imaging system of first embodiment.By Figure 1A it is found that optical imaging system 10 is by object side It sequentially include aperture 100, the first lens 110, the second lens 120, the third lens 130, the 4th lens 140, infrared ray to image side Optical filter 170, imaging surface 180 and image sensing component 190.
First lens 110 have positive refracting power, and are plastic material, and object side 112 is convex surface, and image side surface 114 is Concave surface, and be all aspherical, and its object side 112 and image side surface 114 all have a point of inflexion.First lens object side is in light Intersection point on axis to horizontal displacement distance parallel with optical axis between the point of inflexion of the first nearest optical axis in lens object side with SGI111 indicate, the first lens image side surface between the point of inflexion of the intersection point on optical axis to the first nearest optical axis of lens image side surface with The parallel horizontal displacement distance of optical axis is indicated with SGI121, meets following condition: SGI111=0.2008mm；SGI121= 0.0113mm；│ SGI111 │/(│ SGI111 │+TP1)=0.3018；│ SGI121 │/(│ SGI121 │+TP1)=0.0238.
First lens object side is in the intersection point on optical axis between the point of inflexion and optical axis of the first nearest optical axis in lens object side Vertical range indicate that the first lens image side surface is in the intersection point on optical axis to the first nearest optical axis of lens image side surface with HIF111 Vertical range between the point of inflexion and optical axis is indicated with HIF121, meets following condition: HIF111=0.7488mm；HIF121= 0.4451mm；HIF111/HOI=0.2552；HIF121/HOI=0.1517.
Second lens 120 have positive refracting power, and are plastic material, and object side 122 is concave surface, and image side surface 124 is Convex surface, and be all aspherical, and its object side 122 has a point of inflexion.Second lens object side is in the intersection point on optical axis to The horizontal displacement distance parallel with optical axis is indicated between the point of inflexion of the two nearest optical axises in lens object side with SGI211, the second lens Image side surface is in the intersection point on optical axis to horizontal displacement parallel with optical axis between the point of inflexion of the second nearest optical axis of lens image side surface Distance is indicated with SGI221, meets following condition: SGI211=-0.1791mm；│ SGI211 │/(│ SGI211 │+TP2)= 0.3109。
Second lens object side is in the intersection point on optical axis between the point of inflexion and optical axis of the second nearest optical axis in lens object side Vertical range indicate that the second lens image side surface is in the intersection point on optical axis to the second nearest optical axis of lens image side surface with HIF211 Vertical range between the point of inflexion and optical axis is indicated with HIF221, meets following condition: HIF211=0.8147mm；HIF211/ HOI=0.2777；HIF221=0.1856mm；HIF221/HOI=0.063258.
The third lens 130 have negative refracting power, and are plastic material, and object side 132 is concave surface, and image side surface 134 is Convex surface, and be all aspherical, and its image side surface 134 has a point of inflexion.The third lens object side is in the intersection point on optical axis to The horizontal displacement distance parallel with optical axis is indicated between the point of inflexion of the three nearest optical axises in lens object side with SGI311, the third lens Image side surface is in the intersection point on optical axis to horizontal displacement parallel with optical axis between the point of inflexion of the nearest optical axis of the third lens image side surface Distance is indicated with SGI321, meets following condition: SGI321=-0.1647mm；│ SGI321 │/(│ SGI321 │+TP3)= 0.1884。
Vertical range between the point of inflexion and optical axis of the nearest optical axis in the third lens object side indicates with HIF311, the third lens Image side surface in the intersection point on optical axis to the vertical range between the point of inflexion and optical axis of the nearest optical axis of the third lens image side surface with HIF321 is indicated, meets following condition: HIF311=0.1089mm；HIF311/HOI=0.037117；HIF321= 0.7269mm；HIF321/HOI=0.2477.
4th lens 140 have negative refracting power, and are plastic material, and object side 142 is convex surface, and image side surface 144 is Concave surface, and be all aspherical, and its object side 142 has a point of inflexion with two points of inflexion and image side surface 144.4th lens Object side is in the intersection point on optical axis to horizontal displacement parallel with optical axis between the point of inflexion of the 4th nearest optical axis in lens object side Distance indicates that the 4th lens image side surface is in the intersection point on optical axis to the point of inflexion of the 4th nearest optical axis of lens image side surface with SGI411 Between the horizontal displacement distance parallel with optical axis indicated with SGI421, meet following condition: SGI411=0.0137mm； SGI421=0.0922mm；│ SGI411 │/(│ SGI411 │+TP4)=0.0155；│ SGI421 │/(│ SGI421 │+TP4)= 0.0956。
4th lens object side is in the intersection point on optical axis to the 4th lens object side second close between the point of inflexion of optical axis The horizontal displacement distance parallel with optical axis is indicated with SGI412, meets following condition: SGI412=-0.1518mm；│SGI412 │/(│ SGI412 │+TP4)=0.1482.
Vertical range between the point of inflexion and optical axis of the 4th nearest optical axis in lens object side indicates with HIF411, the 4th lens Vertical range between the point of inflexion and optical axis of the nearest optical axis of image side surface is indicated with HIF421, meets following condition: HIF411= 0.2890mm；HIF421=0.5794mm；HIF411/HOI=0.0985；HIF421/HOI=0.1975.
Vertical range between the point of inflexion and optical axis of 4th lens object side the second dipped beam axis is indicated with HIF412, is met Following condition: HIF412=1.3328mm；HIF412/HOI=0.4543.
Infrared filter 170 is glass material, is set between the 4th lens 140 and imaging surface 180 and does not influence light Learn the focal length of imaging system.
In the optical imaging system of first embodiment, the focal length of optical imaging system is f, the entrance pupil of optical imaging system Diameter is HEP, and the half at maximum visual angle is HAF in optical imaging system, and numerical value is as follows: f=3.4375mm；F/HEP= 2.23；And HAF=39.69 degree and tan (HAF)=0.8299.
In the optical imaging system of first embodiment, the focal length of the first lens 110 is f1, and the focal length of the 4th lens 140 is F4 meets following condition: f1=3.2736mm；│=1.0501 │ f/f1；F4=-8.3381mm；And │ f1/f4 │= 0.3926。
In the optical imaging system of first embodiment, the focal length of the second lens 120 to the third lens 130 is respectively f2, f3, It meets following condition: │ f2 │+│ f3 │=10.0976mm；│ f1 │+│ f4 │=11.6116mm and │ f2 │+│ f3 │ < │ f1 │+│ f4│。
The focal length f of optical imaging system and per a piece of lens with positive refracting power focal length fp ratio PPR, optics at The ratio NPR of focal length f as the system and focal length fn per a piece of lens with negative refracting power, the optical imagery of first embodiment In system, the PPR summation of the lens of all positive refracting powers is │=1.95585 Σ PPR=│ f/f1 │+│ f/f2, all negative flexions The NPR summation of the lens of power is │=2.04224 Σ NPR=│ f/f3 │+│ f/f4 │=0.95770, Σ PPR/ │ Σ NPR.Simultaneously Also meet following condition: │=1.05009 │ f/f1；│=0.90576 │ f/f2；│=0.54543 │ f/f3；│ f/f4 │= 0.41227。
In the optical imaging system of first embodiment, between 112 to the 4th lens image side surface 144 of the first lens object side away from From for InTL, the first lens object side 112 to the distance between imaging surface 180 is HOS, aperture 100 to the distance between imaging surface 180 For InS, the half of the effective sensing region diagonal line length of image sensing component 190 is HOI, the 4th lens image side surface 144 to imaging Distance between face 180 is InB, meets following condition: InTL+InB=HOS；HOS=4.4250mm；HOI=2.9340mm； HOS/HOI=1.5082；HOS/f=1.2873；InTL/HOS=0.7191；InS=4.2128mm；And InS/HOS= 0.95204。
In the optical imaging system of first embodiment, on optical axis it is all tool refracting powers lens thickness summation be Σ TP meets following condition: Σ TP=2.4437mm；And Σ TP/InTL=0.76793.Whereby, when system can be combined The yield of contrast and the lens manufacture of imaging simultaneously provides back focal length appropriate to accommodate other assemblies.
In the optical imaging system of first embodiment, the radius of curvature of the first lens object side 112 is R1, the first lens picture The radius of curvature of side 114 is R2, meets following condition: │=0.1853 │ R1/R2.Whereby, the first lens has suitably Positive refracting power intensity, avoids spherical aberration increase from overrunning.
In the optical imaging system of first embodiment, the radius of curvature of the 4th lens object side 142 is R7, the 4th lens picture The radius of curvature of side 144 is R8, meets following condition: (R7-R8)/(R7+R8)=0.2756.Whereby, be conducive to correct Astigmatism caused by optical imaging system.
In the optical imaging system of first embodiment, the difference focal length of the first lens 110 and the second lens 120 is respectively The focal length summation of f1, f2, the lens of all positive refracting powers of tool are Σ PP, meet following condition: Σ PP=f1+f2= 7.0688mm；And f1/ (Σ PP)=0.4631.Whereby, facilitate suitably distribute the first lens 110 positive refracting power to other Positive lens, to inhibit the generation of the significant aberration of incident ray traveling process.
In the optical imaging system of first embodiment, the difference focal length of the third lens 130 and the 4th lens 140 is respectively f3 And f4, the focal length summation of the lens of all negative refracting powers of tool is Σ NP, meets following condition: Σ NP=f3+f4=- 14.6405mm；And f4/ (Σ NP)=0.5695.Whereby, the negative refracting power for facilitating suitably to distribute the 4th lens is negative to other Lens, to inhibit the generation of the significant aberration of incident ray traveling process.
In the optical imaging system of first embodiment, the first lens 110 and the second lens 120 are in the spacing distance on optical axis For IN12, meet following condition: IN12=0.3817mm；IN12/f=0.11105.Whereby, facilitate the color of improvement lens Difference is to promote its performance.
In the optical imaging system of first embodiment, the second lens 120 are with the third lens 130 in the spacing distance on optical axis For IN23, meet following condition: IN23=0.0704mm；IN23/f=0.02048.Whereby, facilitate the color of improvement lens Difference is to promote its performance.
In the optical imaging system of first embodiment, the third lens 130 and the 4th lens 140 are in the spacing distance on optical axis For IN34, meet following condition: IN34=0.2863mm；IN34/f=0.08330.Whereby, facilitate the color of improvement lens Difference is to promote its performance.
In the optical imaging system of first embodiment, the first lens 110 and the second lens 120 are distinguished in the thickness on optical axis For TP1 and TP2, meet following condition: TP1=0.46442mm；TP2=0.39686mm；TP1/TP2=1.17023 with And (TP1+IN12)/TP2=2.13213.Whereby, facilitate to control the susceptibility of optical imaging system manufacture and promote its property Energy.
In the optical imaging system of first embodiment, the third lens 130 and the 4th lens 140 are distinguished in the thickness on optical axis For TP3 and TP4, aforementioned two lens are IN34 in the spacing distance on optical axis, meet following condition: TP3= 0.70989mm；TP4=0.87253mm；TP3/f=0.20651；TP4/f=0.23668；TP3/TP4=0.81359 and (TP4+IN34)/TP3=1.63248.Whereby, facilitate to control the susceptibility of optical imaging system manufacture and to reduce system always high Degree.
In the optical imaging system of first embodiment, meet following condition: IN23/ (TP2+IN23+TP3)= 0.05980.It helps whereby and corrects aberration caused by incident light traveling process a little layer by layer and reduce system total height.
In the optical imaging system of first embodiment, the 4th lens object side 142 is in the intersection point on optical axis to the 4th lens The maximum effective radius position of object side 142 is InRS41 in the horizontal displacement distance of optical axis, and the 4th lens image side surface 144 is in light Intersection point on axis to the maximum effective radius position of the 4th lens image side surface 144 in the horizontal displacement distance of optical axis be InRS42, 4th lens 140 are in, with a thickness of TP4, meeting following condition: InRS41=-0.23761mm on optical axis；InRS42=- 0.20206mm；│ InRS41 │+│ InRS42 │=0.43967mm；│ InRS41 │/TP4=0.27232；And │ InRS42 │/TP4 =0.23158.Be conducive to eyeglass production and molding whereby, and effectively maintain its miniaturization.
In the optical imaging system of the present embodiment, the critical point C41 of the 4th lens object side 142 and the vertical range of optical axis For HVT41, the critical point C42 of the 4th lens image side surface 144 and the vertical range of optical axis are HVT42, meet following condition: HVT41=0.5695mm；HVT42=1.3556mm；HVT41/HVT42=0.4201.It whereby, can effective modified off-axis visual field Aberration.
The optical imaging system of the present embodiment its meet following condition: HVT42/HOI=0.4620.Whereby, facilitate light Learn the lens error correction of the peripheral vision of imaging system.
The optical imaging system of the present embodiment its meet following condition: HVT42/HOS=0.3063.Whereby, facilitate light Learn the lens error correction of the peripheral vision of imaging system.
In the optical imaging system of first embodiment, the abbe number of the first lens is NA1, the abbe number of the second lens For NA2, the abbe number of the third lens is NA3, and the abbe number of the 4th lens is NA4, meets following condition: │ NA1-NA2 │=0；NA3/NA2=0.39921.Whereby, facilitate the amendment of optical imaging system color difference.
In the optical imaging system of first embodiment, optical imaging system in knot as when
TV distortion be TDT, tie as when optical distortion be ODT, meet following condition: │ TDT │=0.4%；│ ODT │= 2.5%.
Cooperate again referring to following table one and table two.
The asphericity coefficient of table two, first embodiment
Table one is the detailed structured data of first embodiment, and wherein the unit of radius of curvature, thickness, distance and focal length is Mm, and surface 0-14 is sequentially indicated by the surface of object side to image side.Table two is the aspherical surface data in first embodiment, wherein k Conical surface coefficient in table aspheric curve equation, A1-A20 then indicate each surface 1-20 rank asphericity coefficient.In addition, following Each embodiment table is the schematic diagram and aberration curve figure of corresponding each embodiment, in table the definition of data all with first embodiment Table one and table two definition it is identical, be not added repeat herein.
Second embodiment
A and Fig. 2 B referring to figure 2., wherein Fig. 2A is painted a kind of optical imaging system according to second embodiment of the invention Schematic diagram, Fig. 2 B are sequentially spherical aberration, astigmatism and the optical distortion curve graph of the optical imaging system of second embodiment from left to right. Fig. 2 C is the TV distortion curve of the optical imaging system of second embodiment.By Fig. 2A it is found that optical imaging system 20 is by object side It sequentially include the first lens 210, aperture 200, the second lens 220, the third lens 230, the 4th lens 240, infrared ray to image side Optical filter 270, imaging surface 280 and image sensing component 290.
First lens 210 have positive refracting power, and are plastic material, and object side 212 is convex surface, and image side surface 214 is Concave surface, and be all aspherical, and its object side 212 and image side surface 214 all have a point of inflexion.
Second lens 220 have negative refracting power, and are plastic material, and object side 222 is convex surface, and image side surface 224 is Concave surface, and be all aspherical, and its object side 222 has two points of inflexion.
The third lens 230 have positive refracting power, and are plastic material, and object side 232 is concave surface, and image side surface 234 is Convex surface, and be all aspherical, and its image side surface 234 has two points of inflexion.
4th lens 240 have negative refracting power, and are plastic material, and object side 242 is convex surface, and image side surface 244 is Concave surface, and be all aspherical, and its object side 242 has a point of inflexion with two points of inflexion and image side surface 244.
Infrared filter 270 is glass material, is set between the 4th lens 240 and imaging surface 280 and does not influence light Learn the focal length of imaging system.
In the optical imaging system of second embodiment, the focal length of 220 to the 4th lens 240 of the second lens be respectively f2, f3, F4 meets following condition: │ f2 │+│ f3 │=15.7857mm；│ f1 │+│ f4 │=5.6102mm；And │ f2 │+│ f3 │ > │ f1 │ +│f4│。
In the optical imaging system of second embodiment, the first lens 210, the third lens 230 are positive lens, burnt respectively Away from respectively f1 and f3, the focal length summation of the lens of all positive refracting powers of tool is Σ PP, meets following condition: Σ PP=f1 +f3.Whereby, the positive refracting power for facilitating suitably to distribute the first lens 210 is to other positive lens, to inhibit incident light traveling process The generation of significant aberration.
In the optical imaging system of second embodiment, the difference focal length of the second lens 220 and the 4th lens 240 is respectively f2 And f4, the focal length summation of the lens of all negative refracting powers of tool is Σ NP, meets following condition: Σ NP=f2+f4.Whereby, Facilitate the appropriate negative refracting power for distributing the 4th lens 240 to other negative lenses.
It please cooperate referring to following table three and table four.
The asphericity coefficient of table four, second embodiment
In second embodiment, aspherical fitting equation indicates the form such as first embodiment.In addition, following table parameter Definition is all identical with the first embodiment, and not in this to go forth.
Following condition formulae numerical value can be obtained according to table three and table four:
Following condition formulae numerical value can be obtained according to table three and table four:
3rd embodiment
A and Fig. 3 B referring to figure 3., wherein Fig. 3 A is painted a kind of optical imaging system according to third embodiment of the invention Schematic diagram, Fig. 3 B are sequentially spherical aberration, astigmatism and the optical distortion curve graph of the optical imaging system of 3rd embodiment from left to right. Fig. 3 C is the TV distortion curve of the optical imaging system of 3rd embodiment.By Fig. 3 A it is found that optical imaging system 30 is by object side It sequentially include the first lens 310, aperture 300, the second lens 320, the third lens 330, the 4th lens 340, infrared ray to image side Optical filter 370, imaging surface 380 and image sensing component 390.
First lens 310 have positive refracting power, and are plastic material, and object side 312 is convex surface, and image side surface 314 is Convex surface, and be all aspherical, object side 312, object side 312 has a point of inflexion.
Second lens 320 have negative refracting power, and are plastic material, and object side 322 is concave surface, and image side surface 324 is Concave surface, and be all it is aspherical, object side 322 have four points of inflexion.
The third lens 330 have positive refracting power, and are plastic material, and object side 332 is concave surface, and image side surface 334 is Convex surface, and be all it is aspherical, image side surface 334 have two points of inflexion.
4th lens 340 have negative refracting power, and are plastic material, and object side 342 is convex surface, and image side surface 344 is Concave surface, and be all aspherical, and its object side 342 has a point of inflexion with two points of inflexion and image side surface 344.
Infrared filter 370 is glass material, is set between the 4th lens 340 and imaging surface 380 and does not influence light Learn the focal length of imaging system.
In the optical imaging system of 3rd embodiment, the focal length of 320 to the 4th lens 340 of the second lens be respectively f2, f3, F4 meets following condition: │ f2 │+│ f3 │=7.7448mm；│ f1 │+│ f4 │=4.2836mm；And │ f2 │+│ f3 │ > │ f1 │+ │f4│。
In the optical imaging system of 3rd embodiment, the focal length summation of the lens of all positive refracting powers of tool is Σ PP, is expired Foot column condition: Σ PP=f1+f3.Whereby, the positive refracting power for facilitating suitably to distribute the first lens 310 to other positive lens, To inhibit the generation of the significant aberration of incident ray traveling process.
In the optical imaging system of 3rd embodiment, the focal length summation of the lens of all negative refracting powers of tool is Σ NP, is expired Foot column condition: Σ NP=f2+4.Whereby, facilitate the appropriate negative refracting power for distributing the 4th lens 340 to other negative lenses.
It please cooperate referring to following table five and table six.
The asphericity coefficient of table six, 3rd embodiment
In 3rd embodiment, aspherical fitting equation indicates the form such as first embodiment.In addition, following table parameter Definition is all identical with the first embodiment, and not in this to go forth.
Following condition formulae numerical value can be obtained according to table five and table six:
Following condition formulae numerical value can be obtained according to table five and table six:
Fourth embodiment
A and Fig. 4 B referring to figure 4., wherein Fig. 4 A is painted a kind of optical imaging system according to fourth embodiment of the invention Schematic diagram, Fig. 4 B are sequentially spherical aberration, astigmatism and the optical distortion curve graph of the optical imaging system of fourth embodiment from left to right. Fig. 4 C is the TV distortion curve of the optical imaging system of fourth embodiment.By Fig. 4 A it is found that optical imaging system 40 is by object side It sequentially include the first lens 410, aperture 400, the second lens 420, the third lens 430, the 4th lens 440, infrared ray to image side Optical filter 470, imaging surface 480 and image sensing component 490.
First lens 410 have positive refracting power, and are plastic material, and object side 412 is convex surface, and image side surface 414 is Convex surface, and be all aspherical, and its object side 412 has a point of inflexion.
Second lens 420 have negative refracting power, and are plastic material, and object side 422 is convex surface, and image side surface 424 is Concave surface, and be all aspherical, and its object side 422 has two points of inflexion.
The third lens 430 have positive refracting power, and are plastic material, and object side 432 is concave surface, and image side surface 434 is Convex surface, and be all aspherical, and its image side surface 434 has two points of inflexion.
4th lens 440 have negative refracting power, and are plastic material, and object side 442 is convex surface, and image side surface 444 is Concave surface, and be all aspherical, and its object side 442 has a point of inflexion with three points of inflexion and image side surface 444.
Infrared filter 470 is glass material, is set between the 4th lens 440 and imaging surface 480 and does not influence light Learn the focal length of imaging system.
In the optical imaging system of fourth embodiment, the focal length of 420 to the 4th lens 440 of the second lens be respectively f2, f3, F4 meets following condition: │ f2 │+│ f3 │=9.8117mm；│ f1 │+│ f4 │=4.5239mm；And │ f2 │+│ f3 │ > │ f1 │+ │f4│。
In the optical imaging system of fourth embodiment, the focal length summation of the lens of all positive refracting powers of tool is Σ PP, is expired Foot column condition: Σ PP=f1+f3.Whereby, the positive refracting power for facilitating suitably to distribute the first lens 410 to other positive lens, To inhibit the generation of the significant aberration of incident ray traveling process.
In the optical imaging system of fourth embodiment, the focal length summation of the lens of all negative refracting powers of tool is Σ NP, is expired Foot column condition: Σ NP=f2+f4.Whereby, facilitate the appropriate negative refracting power for distributing the 4th lens 440 to other negative lenses.
It please cooperate referring to following table seven and table eight.
The asphericity coefficient of table eight, fourth embodiment
In fourth embodiment, aspherical fitting equation indicates the form such as first embodiment.In addition, following table parameter Definition is all identical with the first embodiment, and not in this to go forth.
Following condition formulae numerical value can be obtained according to table seven and table eight:
Following condition formulae numerical value can be obtained according to table seven and table eight:
5th embodiment
A and Fig. 5 B referring to figure 5., wherein Fig. 5 A is painted a kind of optical imaging system according to fifth embodiment of the invention Schematic diagram, Fig. 5 B are sequentially spherical aberration, astigmatism and the optical distortion curve graph of the optical imaging system of the 5th embodiment from left to right. Fig. 5 C is the TV distortion curve of the optical imaging system of the 5th embodiment.By Fig. 5 A it is found that optical imaging system 50 is by object side It sequentially include the first lens 510, aperture 500, the second lens 520, the third lens 530, the 4th lens 540, infrared ray to image side Optical filter 570, imaging surface 580 and image sensing component 590.
First lens 510 have positive refracting power, and are plastic material, and object side 512 is convex surface, and image side surface 514 is Convex surface, and be all it is aspherical, object side 512 have a point of inflexion.
Second lens 520 have negative refracting power, and are plastic material, and object side 522 is convex surface, and image side surface 524 is Concave surface, and be all aspherical, and its object side 522 has two points of inflexion.
The third lens 530 have positive refracting power, and are plastic material, and object side 532 is concave surface, and image side surface 534 is Convex surface, and be all aspherical, and its image side surface 534 has two points of inflexion.
4th lens 540 have negative refracting power, and are plastic material, and object side 542 is convex surface, and image side surface 544 is Concave surface, and be all aspherical, and its object side 542 has a point of inflexion with three points of inflexion and image side surface 544.
Infrared filter 570 is glass material, is set between the 4th lens 540 and imaging surface 580 and does not influence light Learn the focal length of imaging system.
In the optical imaging system of 5th embodiment, the focal length of 520 to the 4th lens 540 of the second lens be respectively f2, f3, F4 meets following condition: │ f2 │+│ f3 │=10.1202mm；│ f1 │+│ f4 │=4.7004mm；And │ f2 │+│ f3 │ > │ f1 │ +│f4│。
In the optical imaging system of 5th embodiment, the focal length summation of the lens of all positive refracting powers of tool is Σ PP, is expired Foot column condition: Σ PP=f1+f3.Whereby, the positive refracting power for facilitating suitably to distribute the first lens 510 to other positive lens, To inhibit the generation of the significant aberration of incident ray traveling process.
In the optical imaging system of 5th embodiment, the focal length summation of the lens of all negative refracting powers of tool is Σ NP, is expired Foot column condition: Σ NP=f2+f4.Whereby, facilitate the appropriate negative refracting power for distributing the 4th lens 540 to other negative lenses.
It please cooperate referring to following table nine and table ten.
The asphericity coefficient of table ten, the 5th embodiment
In 5th embodiment, aspherical fitting equation indicates the form such as first embodiment.In addition, following table parameter Definition is all identical with the first embodiment, and not in this to go forth.
Following condition formulae numerical value can be obtained according to table nine and table ten:
Following condition formulae numerical value can be obtained according to table nine and table ten:
Sixth embodiment
Please refer to Fig. 6 A and Fig. 6 B, wherein Fig. 6 A is painted a kind of optical imaging system according to sixth embodiment of the invention Schematic diagram, Fig. 6 B are sequentially spherical aberration, astigmatism and the optical distortion curve graph of the optical imaging system of sixth embodiment from left to right. Fig. 6 C is the TV distortion curve of the optical imaging system of sixth embodiment.By Fig. 6 A it is found that optical imaging system 60 is by object side It sequentially include the first lens 610, aperture 600, the second lens 620, the third lens 630, the 4th lens 640, infrared ray to image side Optical filter 670, imaging surface 680 and image sensing component 690.
First lens 610 have positive refracting power, and are plastic material, and object side 612 is convex surface, and image side surface 614 is Convex surface, and be all aspherical, and its object side 612 has a point of inflexion.
Second lens 620 have positive refracting power, and are plastic material, and object side 622 is convex surface, and image side surface 624 is Concave surface, and be all aspherical, and its object side 622 has two points of inflexion.
The third lens 630 have negative refracting power, and are plastic material, and object side 632 is concave surface, and image side surface 634 is Convex surface, and be all aspherical, and its image side surface 634 has two points of inflexion.
4th lens 640 have positive refracting power, and are plastic material, and object side 642 is convex surface, and image side surface 644 is Concave surface, and be all aspherical, and its object side 642 has a point of inflexion with three points of inflexion and image side surface 644.
Infrared filter 670 is glass material, is set between the 4th lens 640 and imaging surface 680 and does not influence light Learn the focal length of imaging system.
In the optical imaging system of sixth embodiment, the focal length of 620 to the 4th lens 640 of the second lens be respectively f2, f3, F4 meets following condition: │ f2 │+│ f3 │=10.1424mm；│ f1 │+│ f4 │=4.7155mm；And │ f2 │+│ f3 │ < │ f1 │ +│f4│。
In the optical imaging system of sixth embodiment, the focal length summation of the lens of all positive refracting powers of tool is Σ PP, is expired Foot column condition: Σ PP=f1+f3.Whereby, the positive refracting power for facilitating suitably to distribute the first lens 610 to other positive lens, To inhibit the generation of the significant aberration of incident ray traveling process.
In the optical imaging system of sixth embodiment, the focal length summation of the lens of all negative refracting powers of tool is Σ NP, is expired Foot column condition: Σ NP=f2+f4.Whereby, facilitate the appropriate negative refracting power for distributing the 4th lens to other negative lenses.
It please cooperate referring to following table 11 and table 12.
The asphericity coefficient of table 12, sixth embodiment
In sixth embodiment, aspherical fitting equation indicates the form such as first embodiment.In addition, following table parameter Definition is all identical with the first embodiment, and not in this to go forth.
Following condition formulae numerical value can be obtained according to table 11 and table 12:
Following condition formulae numerical value can be obtained according to table 11 and table 12:
Although the present invention is disclosed above with embodiment, however, it is not to limit the invention, any to be familiar with this skill Person, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations, therefore protection scope of the present invention is worked as Subject to appended claims institute defender.
It will be those skilled in the art although the present invention is particularly shown with reference to its exemplary embodiments and describes It will be understood by, it can be to it under spirit and scope of the invention defined in the appended claims and its equivalent in not departing from Various changes in carry out form and details.

Claims (24)

1. a kind of optical imaging system sequentially includes by object side to image side:
First lens have positive refracting power；
Second lens have refracting power；
The third lens have refracting power；
4th lens have refracting power；And
Imaging surface；
Wherein the optical imaging system has the lens of refracting power for four pieces and first lens are into the 4th lens An at least surface for each lens of at least two lens has an at least point of inflexion, and second lens are into the 4th lens An at least lens have a positive refracting power, and the object side surface of the 4th lens and image side surface be all it is aspherical, described the The focal length of one lens to the 4th lens is respectively f1, f2, f3, f4, and the focal length of the optical imaging system is f, the light Learn imaging system entrance pupil diameter be HEP, the first lens object side to the imaging surface on optical axis have a distance HOS further includes aperture, in aperture described on optical axis to the imaging surface on optical axis have a distance InS, the optical imagery System is equipped with image sensing component and 8,000,000 pixels in the imaging surface and is at least arranged, and the image sensing component is effective The half of sensing region diagonal line length is HOI, meets following condition: 1.2≤f/HEP≤3.0；0.5≦HOS/f≦4.45/ 3.4817；0.5≦InS/HOS≦1.2；And HOI > 2.3mm.
2. optical imaging system as described in claim 1, wherein the optical imaging system in knot as when TV distortion be TDT, the optical imaging system in knot as when optical distortion be ODT, the half of the visible angle of the optical imaging system For HAF, meet following equation: 0deg < HAF≤70deg；│ TDT │ < 60% and │ ODT │ < 50%.
3. optical imaging system as described in claim 1, wherein each of the third lens and the 4th lens are saturating An at least surface for mirror has at least one point of inflexion.
4. optical imaging system as claimed in claim 3, wherein any surface of the 4th lens all has at least one The point of inflexion.
5. optical imaging system as claimed in claim 3, wherein each of first lens and second lens are saturating An at least surface for mirror has at least one point of inflexion.
6. optical imaging system as described in claim 1, wherein the vertical range between the point of inflexion and optical axis is HIF, Meet following equation: 0mm < HIF≤5mm.
7. optical imaging system as described in claim 1, the refracting power wherein the 4th lens are negative.
8. optical imaging system as described in claim 1, wherein the first lens object side to the 4th lens image side Face has a distance InTL, and meets following equation: 0.5≤InTL/HOS≤0.9.
9. optical imaging system as claimed in claim 5, wherein the vertical range between the point of inflexion and optical axis is HIF, it is full Sufficient following relationship: 0 < HIF/HOI≤0.9.
10. a kind of optical imaging system sequentially includes by object side to image side:
First lens have positive refracting power；
Second lens have refracting power；
The third lens have refracting power；
4th lens have refracting power；And
Imaging surface；
Wherein the optical imaging system has the lens of refracting power for four pieces and first lens are into the 4th lens An at least surface for each lens of at least two lens has an at least point of inflexion, and second lens are into the 4th lens An at least lens have a positive refracting power, and the object side surface of the 4th lens and image side surface be all it is aspherical, described the The focal length of one lens to the 4th lens is respectively f1, f2, f3, f4, and the focal length of the optical imaging system is f, the light Learn imaging system entrance pupil diameter be HEP, the first lens object side to the imaging surface on optical axis have a distance HOS, the half at the maximum visual angle of the optical imaging system are HAF, the optical imaging system in knot as when TV distortion with Optical distortion is respectively TDT and ODT, further includes aperture, in aperture described on optical axis to the imaging surface on optical axis have one Distance InS, the optical imaging system are equipped with image sensing component and 8,000,000 pixels in the imaging surface and are at least arranged, The half of the effective sensing region diagonal line length of image sensing component is HOI, meets following condition: 1.2≤f/HEP≤ 3.0；0.5≦HOS/f≦4.45/3.4817；0.4≦│tan(HAF)│≦3.0；│ TDT │ < 60%；│ ODT │≤50%；0.5≦ InS/HOS≦1.2；And HOI > 2.3mm.
11. optical imaging system as claimed in claim 10, wherein each of the third lens and the 4th lens An at least surface for lens has at least one point of inflexion.
12. optical imaging system as claimed in claim 10, wherein each of first lens and second lens An at least surface for lens has at least one point of inflexion.
13. optical imaging system as claimed in claim 10, wherein the optical imaging system meets following equation: 0mm < HOS≦7mm。
14. optical imaging system as claimed in claim 10, wherein in light between first lens and second lens Distance on axis is IN12, and meets following equation: 0 < IN12/f≤0.2.
15. optical imaging system as claimed in claim 10, wherein in light between the third lens and the 4th lens Distance on axis is IN34, and meets following equation: 0 < IN34/f≤0.2.
16. optical imaging system as claimed in claim 10, wherein the third lens on optical axis with a thickness of TP3, and Meet following equation: 0 < TP3/f≤0.2.
17. optical imaging system as claimed in claim 10, wherein the 4th lens on optical axis with a thickness of TP4, and Meet following equation: 0 < TP4/f≤0.2.
18. optical imaging system as claimed in claim 10, wherein first lens and second lens are on optical axis Thickness be respectively TP1 and TP2, first lens between second lens at a distance from optical axis be IN12, Meet following condition: 0 < (TP1+IN12)/TP2≤10.
19. optical imaging system as claimed in claim 10, wherein focal length point of first lens to the 4th lens Not Wei f1, f2, f3, f4, the focal length of the optical imaging system is f, and the optical imaging system meets following condition: 0 < │ f/ f1│≦2；0<│f/f2│≦2；0<│f/f3│≦2；And │≤3 0 < │ f/f4.
20. a kind of optical imaging system sequentially includes by object side to image side:
First lens have positive refracting power；
Second lens have negative refracting power；
The third lens have refracting power, and at least one side has at least one point of inflexion in object side surface and image side surface；
4th lens have refracting power, and at least one side has at least one point of inflexion in object side surface and image side surface；With And
Imaging surface；
It is four pieces that wherein the optical imaging system, which has the lens of refracting power, and the object side surface of the 4th lens and picture Side surface be all it is aspherical, in first lens and second lens an at least surface for an at least lens have at least One point of inflexion, the focal length of first lens to the 4th lens are respectively f1, f2, f3, f4, the optical imaging system Focal length be f, the entrance pupil diameter of the optical imaging system is HEP, the half at the maximum visual angle of the optical imaging system For HAF, the first lens object side to the imaging surface in having a distance HOS on optical axis, the optical imaging system in Tie as when optical distortion be ODT and TV distortion be TDT, aperture is further included, in aperture described on optical axis to the imaging surface In having a distance InS on optical axis, the optical imaging system is equipped with image sensing component and sets in the imaging surface and at least 8,000,000 pixels are set, the half of the effective sensing region diagonal line length of image sensing component is HOI, meet following condition: 1.2≦f/HEP≦2.8；0.4≦│tan(HAF)│≦3.0；0.5≦HOS/f≦4.45/3.4817；│ TDT │ < 60%；│ODT│ ≤ 50%；0.5≦InS/HOS≦1.2；And HOI > 2.3mm.
21. optical imaging system as claimed in claim 20, the vertical range between the point of inflexion and optical axis is HIF, is expired Sufficient following equation: 0mm < HIF≤5mm.
22. optical imaging system as claimed in claim 21, wherein the focal length f of the optical imaging system has with per a piece of The ratio f/fp of each of the focal length fp of lens of positive refracting power is PPR, the focal length f of the optical imaging system and every a piece of tool The ratio f/fn for having each of focal length fn of the lens of negative refracting power is NPR, and the PPR summation of the lens of all positive refracting powers is Σ PPR, the NPR summations of the lens of all negative refracting powers are Σ NPR, meet following condition: 0.5≤Σ PPR/ │ Σ NPR │≤ 4.5。
23. optical imaging system as claimed in claim 20, wherein first lens and the second lens are on optical axis Thickness is respectively TP1, TP2, meets following condition: 0 < TP1/TP2≤10.
24. optical imaging system as claimed in claim 23, wherein the third lens and the 4th lens are on optical axis Thickness is respectively TP3 and TP4, meets following condition: 0 < TP3/TP4≤10.
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